title: Crystal structure of cobra-venom phospholipase A2 in a complex with a transition-state analogue.
abstract: The crystal structure of a complex between a phosphonate transition-state analogue and the phospholipase A2 (PLA2) from Naja naja atra venom has been solved and refined to a resolution of 2.0 angstroms. The identical stereochemistry of the two complexes that comprise the crystal's asymmetric unit indicates both the manner in which the transition state is stabilized and how the hydrophobic fatty acyl chains of the substrate are accommodated by the enzyme during interfacial catalysis. The critical features that suggest the chemistry of binding and catalysis are the same as those seen in the crystal structure of a similar complex formed with the evolutionarily distant bee-venom PLA2.
authors.affiliation: Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06511.
authors.forename: S P
authors.initials: SP
authors.lastname: White
authors.forename: D L
authors.initials: DL
authors.lastname: Scott
authors.forename: Z
authors.initials: Z
authors.lastname: Otwinowski
authors.forename: M H
authors.initials: MH
authors.lastname: Gelb
authors.forename: P B
authors.initials: PB
authors.lastname: Sigler
mesh_terms: D000595:Amino Acid Sequence; D001514:Bee Venoms / Q000032:analysis; D001665:Binding Sites; D002118:Calcium / Q000378:metabolism; D002384:Catalysis; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003460:Crystallization; D004546:Elapid Venoms / Q000032:analysis*; D006860:Hydrogen Bonding; D008969:Molecular Sequence Data; D015394:Molecular Structure; D010714:Phosphatidylethanolamines / Q000378:metabolism*; D010741:Phospholipases A / Q000737:chemistry* / Q000378:metabolism; D054467:Phospholipases A2; D011487:Protein Conformation
chemical_list: D001514:Bee Venoms; D004546:Elapid Venoms; D010714:Phosphatidylethanolamines; C066847:1-O-octyl-2-heptylphosphonylglycero-3-phosphoethanolamine; D010741:Phospholipases A; D054467:Phospholipases A2; D002118:Calcium